The two closest-unlogged stations from here are both AM stations. One is WGMM 1460, NW of Scranton and with 4 sticks having sent both their 5000-day and 1000-night watt directional signals SE into Scranton for years before changing to 2500 D / *86* N omni a year and a half ago. I could not get this Oldies station (on its Gem network) while at the in-laws' house in Scranton one night despite the signal being aimed directly through the city.
I *did* catch the 5000-watt version one afternoon in Hazleton, with 3-4 songs in a row // with the louder WNAK 730 Nanticoke, but Hazleton is 8 miles outside the 10-mile radius I consider the 'zone' for counting stations on one list. (The three locales I've used for DX since moving to PA all have been well inside that 10-mile zone -- a radius that's been resolute since I saw it used among several 1960's National Radio Club DXers who lived in larger cities.)
With loud 'local' Phoenix 1450 having had its sparsley-attended wake a decade ago, both WGMM 1460 and a new closest hiding one is WYNY 1450 in Milford PA, on the Delaware, are temptingly close enough for rock n roll but inaudible. Both WYNY's FM and its FM are pretty new to it all, having signed on blank frequencies some 6-7 years ago. News to me that there were ANY blank frequencies within 100 miles of NYC, never mind for OMNI stations.
I've always thought that the exact midday was the perfect time to try and log such ridiculously stubborn stations. Minimum skywave, if you get me. For a few years back in Queens I logged four New Jersey stations this way (two Trenton's and one 'newer' facility each in Mt. Holly and Parsippany). But the AM dial in the day the past several years is a noisy, raging cascade of QRM that's getting worse.
@MarioMania :
The name 'Matamoros' you listed struck me as being an old American Indian name. Just a bit north of that aforementioned WYNY is a Matamoras PA, also on a river (the Delaware). The place is a pretty stretch of main street/turnpike mix that looks like a model trainset village.
The 'Ma' prefix usually has something to do with a locale near a body of water. Mahantongo, Massapequa and Mahanoy come to mind.
Turns out: Wrong again, Green. Matamoros Mexico was named after a Mexican Civil War hero. And the PA city across the river from Port Jervis NY, spelled differently, was named after the same guy!